Hydrometer-syringe.



F. L. FREAS.

HYDHOMETER SYRINGE APPLICATION FILED OCT- |5I I9I7.

anais Patented Apr. 9, 1918.

FRANCIS L. FREAS, F CONSHOHOCKEN, PENNSYLVANIA.

HYnnoMETEn-SYRINGE.

rename.

Specification of Letters Patent. I

Application filed October 15, 1917. Serial No. 196,581.

To all 'whom t may concern.'

Beit known that I, vFRANCIS L. FREAS, a citizen of the United States, residing in Conshohocken, in the county of Montgomery and State of Pennsylvania, have invented certain new and useful improvements in Hydrometer-Syringes, whereof the following is a specification, reference being had to the accompanying drawings.

My invention relates to a so-called hydrometer syringe which is employed, for instance, in testing storage batteries, or for other similar uses, and the improvements' are addressed toward protecting the fragile hydrometer element of the syringe, and also the glass casing, from accidental injury in case the device should be dropped, or laid down too forcibly under ordinary conditions of use.

Figure I, represents an external side elevation of the device in its preferred form',

Fig. Il, is a longitudinal axial section thereof.

Fig. Ill, is a side elevation of the hydrometer element.

The device, inthe embodiment shown, consists of a cylindrical main float chamber l, which is made of glass, or other transparent material Said chamber is tapered fto a' reduced diameter at one end and the extremity of the orifice is provided with a circumferential flange 2, so as to receive, and form a close joint, with a hollow rubber compression bulb 3. A soft rubber tubular buffer 4, is tightly inserted in the orifice, and projects inwardly a short distance clear of the tapered wall, as shown in Fig. II.

The other end portion of the chamber 1, is preferably slightly reduced, while remaining cylindrical, as shown, and is externally threaded so as to engage in a correspondingly threaded portion 6, of an extension piece 7, which is preferably made of rubber having a moderate degree of pliability. Said piece 7 constitutes an extension chamber, preferably vof considerable axial length, as indicated, and is provided, at a substantial distance from the portion 6, with. a dislc shaped end wall having a iange 10, of deep radial extent, beyond which wall it is further provided with anL axial elongated nozzle piece 8, of reduced'diameter, and, therefore, relatively more flexible as a whole than the main body 7, of the extension piece. A diametrical trough or groove 11, is formed across the inner face of the end wall, to

to come into Contact with the wall afford a free passage for liquid when the hydrometer element is resting upon the wall.

By reference to the drawings it will be noted that although what may be called the rear end portion 6, of the extension chamber 7, may be conveniently somewhat enlarged to afford a proper seat for the screw thread which engages the end of the chamber l, this enlargement is substantially less in external radial projection than the iange l0, and also than the maximum radial projection of the bulb 3. Furthermore, it `will be noted that the cylindrical wall of the extension chamber beyond the portion 6, is of less internal diameter than the proximate end of the main chamber.

The hydrometer element proper is represented in Fig. IH, and is of the well-known type comprising a graduated stem 12, and an elongated bulb 13, the latter being pivotally weighted with shot 14, or in any convenient manner. rl`he dimensions of the hydrometer element are definitely related to those of the float chamber' and extension. Thus, the diameter of the bulb portion 13, is such that while it can move freely within the extension chamber 7, it cannot, when contained therein for a substantial portion of its length, tilt sufficiently forthe stem 12, of the main Hoat chamber 1.

The length of the hydrometer is such that Patenten am. o, taie. y

when in its extreme position of withdrawal A from the extension chamber (as indicated 'in dotted lines), the end of thel stem 12, will come into contact with the buffer piece fl, while the bulb is still sufficiently within the extension chamber, to come into contact with the rubber surface thereof, instead of striking the surface of the glass Hoat chamber l. Furthermore, the diameter of the stem is less than that of the orifice at the region of the buffer el, so that 'the stem canL not slip into the bulb 3, and be broken whenl the latter is compressed, as frequently happens 1n previous devices of this general character.

lill) Furthermore, it will be seen that by reason of the substantial axial length of the extension chamber and the distinct, though slight flexibility thereof in an axial direction, the transmitted shock will be minimized and the danger of breakage will be much less than if the part of the extension chamber which is in direct Contact with the glass casing, as at 6, were reliedon as the projecting guard portion.

Having thus described my invention, l claim:

l. l'llhe combination, with the compression bulb, and the main float chamber; of a relativelyexible extension chamber having one extremity adapted to engage the oat chamber and provided at the other extremity dial depth than any portion of the device intervening between the region'of maximum diameter of the compression bulb and said ange; saidv extension chamber being also with a wall of substantially greater ra- Lanarte provided with a reduced nozzle piece, sub.- stantially as set forth.

2. rll`he combination, of thel compression bulb; the main float chamber havingl a reduced orice provided witlia tubular buder piece; the rubber extension chamber of less internal 'diameter than the main chamber, and having an end wall provided with a deep radial flange; and the hydrometer element comprising an elongated bulb and a stem, the total length of said element being greater than` the distance between the bilder piece and the other end of the main chamber, substantially as set forth. lin testimony whereof, li have hereunto signed my name at Philadelphia, Pennsylvania, this twelfth day of October, 1917.

FRANClS L. FREAS. I

Witnesses:

JAMES H. BELL, E. L. FULLERTON. 

